Presentation on theme: "1.2 Points, Line Segments, Lines and Rays…OH MY!"— Presentation transcript:
1 1.2 Points, Line Segments, Lines and Rays…OH MY!
2 Solve these subtraction problems. Write your answer on your slate. Mental MathSolve these subtraction problems.Write your answer on your slate.9 – 0 =12 – 6 =16 – 9 =17 – 8 =90 – 40 =140 – 70 =
3 Math Message Read SRB pages 88 and 89. In your Math Notebook, please list three places where geometry can be found in our world.Be ready to share.
4 Reviewing Points, Line Segments, Lines and Rays When you connect two points using a straightedge, you create aline segmentABpoints
5 Points, Endpoints and Line Segments Bline segmentletters are often used to name a line segmentONE name for this line segment is “line segment AB”A short way to write “line segment AB” is ABAnother name for this line segment is “line segment BA”What is the short way to write “line segment BA?”
6 Stop and Chat!endpointendpointABHow would you describe a line segment to someone who has never seen one before?What are some examples of line segments that we can find in the world?EXAMPLE: part of a spider web
7 LinespointpointABlinesextending line segment AB in both directions and drawing an arrowhead at each end makes a LINEThis line is called “line AB” or “line BA”A short way to write the names of these lines isAB or BA
8 Stop and Chat! A B How is a line different from a line segment? pointpointABHow is a line different from a line segment?What are some examples of lines that we can find in the world?EXAMPLE: The horizon in a landscape
9 Short way to write the name is CD RayendpointpointCDraysline segment that goes on without end in only ONEdirectionPoint C is the ENDPOINT of the ray CDThe letter that names the ENDPOINT is ALWAYSwritten first.Short way to write the name is CD
10 What are some examples of lines that we can find in the world? Stop, Try and Chat!endpointpointCDShort way to write the name is CDOn your slate, draw ray ZY. Remember that the endpoint of the ray is ALWAYS written first.What are some examples of lines that we can find in the world?Example: Hitting a golf ball
11 Let’s Review! Is it ever possible to draw all of a line? All of a line segment? All of a ray?How many line segments can you name using the points marked on this line?How many rays can you name?
12 Independent work MJ page 4 You can use SRB pages 90 and 91 to help you!
13 Wrap it UP! In your Math Notebook… Draw and label YX Draw and label HG Draw and label VB